Gallery: $60 router + DD-WRT = high-end wireless router

This is the Buffalo WHR-HP-G54 router that sells for
as little as $60 at all the local electronics stores like Circuit City, Best Buy, and Fry's or it can be ordered online. The WHR-G54 sells for
as little as $50 and is virtually identical except for the fact that the WHR-HP-G54 has a receive side amplifier which helps the router hear faint laptops coming in on long-range connections. This particular router can run DD-WRT using
this specific upgrade procedure. DD-WRT can turn this cheap device in to an enterprise class product with enterprise features normally found in devices costing hundreds of dollars more.

DDNS (DynamicDNS) support makes it possible for you to have a name
on the Internet that's accessible from anywhere on the Internet. See
this
tutorial on how to set it up.

DD-WRT has some high-end routing protocols like OSPF and BGP.

DD-WRT can give you managed switch capability in the 4-port switch built-in to your router.

DD-WRT can act as an Access Point, a Wireless ISP client, a Wireless bridge, or Adhoc network.

DD-WRT can support a variety of Wireless LAN security. What I really like is the fact that it can support WPA-PSK and WPA enterprise mode with RADIUS at the same time.

DD-WRT can allow you to jack up the radio transmit power to 251mW which allows the signal to carry far. Note that in order for the client to transmit back, you'll need a very large antenna to hear the faint signal of the laptop. But for long-range AP to AP applications, the higher power becomes very useful.

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This is the Buffalo WHR-HP-G54 router that sells for
as little as $60 at all the local electronics stores like Circuit City, Best Buy, and Fry's or it can be ordered online. The WHR-G54 sells for
as little as $50 and is virtually identical except for the fact that the WHR-HP-G54 has a receive side amplifier which helps the router hear faint laptops coming in on long-range connections. This particular router can run DD-WRT using
this specific upgrade procedure. DD-WRT can turn this cheap device in to an enterprise class product with enterprise features normally found in devices costing hundreds of dollars more.